28357839 has 12 divisors (see below), whose sum is σ = 42283072. Its totient is φ = 18295200.

The previous prime is 28357837. The next prime is 28357841. The reversal of 28357839 is 93875382.

It is an interprime number because it is at equal distance from previous prime (28357837) and next prime (28357841).

It is not a de Polignac number, because 28357839 - 2¹ = 28357837 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28357794 and 28357803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28357837) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 50542 + ... + 51099.

Almost surely, 2^28357839 is an apocalyptic number.

28357839 is a deficient number, since it is larger than the sum of its proper divisors (13925233).

28357839 is a wasteful number, since it uses less digits than its factorization.

28357839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101678 (or 101675 counting only the distinct ones).

The product of its digits is 362880, while the sum is 45.

The square root of 28357839 is about 5325.2078832662. The cubic root of 28357839 is about 304.9470086204.

The spelling of 28357839 in words is "twenty-eight million, three hundred fifty-seven thousand, eight hundred thirty-nine".